A 55-taxicab fleet test was conducted for 160 000 km to determine the effects of low-viscosity and friction-modified engine oils and rear axle lubricants on fuel economy and durability. In GM City-Suburban and 80 km/h constant-speed tests conducted at the Indianapolis Motor Speedway, fuel economy with low-viscosity engine oil and rear axle lubricant combinations was about 1 to 2 percent greater than that with SAE 10W-40 engine oil and SAE 80W-90 rear axle lubricant. These improvements were obtained after 40 000 and 80 000 km of taxicab service. Fuel economy with a graphite-containing SAE 10W-40 engine oil was about 2.5 percent better in both tests. No differences in either engine or rear axle durability were observed among the lubricants. However, oil economy with low-viscosity engine oils was about 20 to 30 percent less than that with the SAE 10W-40 oil. Adding either graphite or MoS2 to an SAE 5W-30 engine oil did not affect oil economy or oil performance, but oil filter plugging was increased in high-mileage cabs. Oil filter plugging increased with increasing engine oil viscosity, filter change interval, and cab mileage.It is concluded that the use of energy-conserving lubricants improves fuel economy for both low- and high-mileage vehicles, without adversely affecting vehicle durability. The significance of this conclusion is that vehicles on the road can benefit from the use of such lubricants.
Taxicab Fuel Economy and Engine and Rear Axle Durability with Low-Viscosity and Friction-Modified Lubricants
Sae Technical Papers
1982 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1982
1982-02-01
Aufsatz (Konferenz)
Englisch
Lubricants , Durability , Fuel economy , Test procedures , Axles , Fleets
STATUS OF AUTOMOTIVE REAR AXLE LUBRICANTS
SAE Technical Papers | 1958
|SAE Technical Papers | 1978
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